Geodetic Surveying Device Point Cloud Georeferencing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current geodetic surveying devices face challenges in efficiently and accurately measuring large-area topographical data, requiring extensive time and limited precision due to individual point targeting and reliance on numerous reference points for accurate shape determination, especially for objects with curved surfaces.
Innovation Solution
A geodetic surveying method and device that enables rapid, precise large-area surface scanning using motorized continuous alignment changes of measurement radiation to generate a point cloud, with automatic referencing to an external coordinate system through known reference points, allowing for high-precision determination of object position, orientation, and spatial extent without additional post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual point targeting is used for surveying, then measurement precision can be maintained, but measurement time increases significantly for large-area surfaces
Solution Approach 1:
The patent segments the measurement process into two distinct phases: (1) rapid scanning phase where measurement radiation is swept across the entire object surface to capture all scan points without stopping, and (2) referencing phase where the same measurement radiation is directed to specific reference points for precise positioning. This segmentation allows the system to achieve both speed (during scanning) and precision (during referencing) without compromise.
Solution Approach 2:
The patent performs preliminary scanning of the entire object surface to capture all scan points before conducting the referencing measurement. By pre-capturing the spatial distribution of all points in the point cloud, the system establishes a comprehensive dataset that can later be precisely positioned using reference points, thereby avoiding the need for time-consuming individual point measurements during the positioning phase.
2Measurement precision
If numerous reference points are used for accurate shape determination, then measurement precision improves, but device complexity and measurement time increase
Solution Approach 1:
The patent makes the measurement radiation multi-functional by enabling it to perform both rapid scanning (capturing all scan points) and precise referencing (targeting reference points) using the same hardware components. The measurement radiation can be rapidly swept across the entire field of view for scanning, then directed to specific reference points for positioning, eliminating the need for separate devices or complex coordination between multiple specialized systems.
Solution Approach 2:
The patent changes the operational parameters of the measurement radiation between scanning and referencing modes. During scanning, the radiation is swept continuously across the field of view with high speed and broad coverage. During referencing, the radiation is directed to specific reference points with precise angular positioning. The system dynamically adjusts scanning parameters (speed, coverage, resolution) based on the operational phase, optimizing performance for each function without requiring separate hardware systems.
3Productivity
If rapid scanning is performed without reference points, then measurement speed increases, but position accuracy in external coordinate system deteriorates
Solution Approach 1:
The patent introduces reference points as intermediary elements that mediate between the rapid scanning process and the external coordinate system. The reference points serve as fixed, known-position markers that are measured during or after scanning. These intermediaries provide the transformation basis needed to accurately position the rapidly captured point cloud in the external coordinate system, bridging the gap between speed-oriented scanning and precision-oriented positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables fast and precise large-area surface measurement with high scan point resolution and accurate object positioning in an external coordinate system, reducing measurement time and improving accuracy compared to traditional methods.
Implementation Method 1
a respective distance and a respective alignment of measurement radiation emitted for a distance measurement are determined
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
Geodetic surveying method comprising deriving surface information for an object (20) and geodetically accurate single-point measurement to at least one reference point (25-27), wherein the at least one reference point (25-27) provides a position reference to an external coordinate system, a measurement radiation (3,33) is directed to the at least one reference point (25-27) and at least one direction to the reference point (25-27) is determined in an internal coordinate system.A reference-point-independent scanning process is performed to derive surface information. This involves scanning a scan area by continuously changing the orientation of the measurement radiation (3, 33), determining the respective distance and orientation of the measurement radiation (3, 33) emitted for distance measurement for scan points located within the defined scan area, and generating a point cloud in the inner coordinate system that represents the surface information and contains the scan points. Furthermore, the inner coordinate system is referenced to the outer coordinate system based at least on the positional reference to the outer coordinate system provided by the reference point (25-27) and the determined direction to the reference point (25-27) in the inner coordinate system, such that at least one orientation of the point cloud in the outer coordinate system is determined.